EP0631437A2 - System zur Aufzeichnung von Teletextdaten - Google Patents

System zur Aufzeichnung von Teletextdaten Download PDF

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Publication number
EP0631437A2
EP0631437A2 EP94110004A EP94110004A EP0631437A2 EP 0631437 A2 EP0631437 A2 EP 0631437A2 EP 94110004 A EP94110004 A EP 94110004A EP 94110004 A EP94110004 A EP 94110004A EP 0631437 A2 EP0631437 A2 EP 0631437A2
Authority
EP
European Patent Office
Prior art keywords
teletext data
data
teletext
signal
recording
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94110004A
Other languages
English (en)
French (fr)
Other versions
EP0631437A3 (de
EP0631437B1 (de
Inventor
Kazuo C/O Tokorozawa Koujou Kuroda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Publication of EP0631437A2 publication Critical patent/EP0631437A2/de
Publication of EP0631437A3 publication Critical patent/EP0631437A3/de
Application granted granted Critical
Publication of EP0631437B1 publication Critical patent/EP0631437B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N5/9201—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving the multiplexing of an additional signal and the video signal
    • H04N5/9206—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving the multiplexing of an additional signal and the video signal the additional signal being a character code signal
    • H04N5/9207—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving the multiplexing of an additional signal and the video signal the additional signal being a character code signal for teletext

Definitions

  • the present invention relates to a system for recording data of a teletext broadcast, and more particularly to a system for simultaneously recording the teletext data and video data of a television signal or the same recording medium.
  • the teletext is a new type of multiplex broadcasting system where information other than regular television programs in the form of characters, simple graphics and additional sounds is transmitted. The information is repeatedly transmitted so that a user may receive the information he chooses at any chosen time.
  • the teletext data in the form of digital signal are carried during the vertical retrace line interval which is an empty time space in the television signal.
  • the user may watch any teletext program of his choice on a television receiver having a built-in decoder, or an ordinary television receiver having a teletext adapter connected thereto.
  • the data are decoded and converted into a television signal, which is recorded by a VCR.
  • the teletext data is applied to a personal computer, which is operated by an exclusive keyboard and stored on a hard disc.
  • a television receiver receives broadcast waves through an antenna.
  • the wave of a particular channel which is selected by a television tuner 1 is converted into a television signal.
  • Teletext data included in the television signal is derived at a teletext decoder 2 and recorded at a VCR 3 on a recording tape in a video cassette.
  • the data is also fed to a television monitor 4 on which the data is shown.
  • Fig. 4 shows the second recording system where the broadcast wave converted into the television signal at the television tuner 1 is fed to a personal computer 5.
  • the user operates an operation keyboard 6 connected to the computer 5 to extract the teletext data from the television signal and to correct errors included therein.
  • the teletext data is then recorded on a hard disc 8.
  • the personal computer 5 processes the data on the hard disc 8 and shows it on a screen of a CRT display 7.
  • the VCR has a pair of heads provided on opposite sides of a rotating drum with which a tape is contacted.
  • One of the heads scans odd fields, and the other head scans even fields.
  • the heads are switched in the vertical retrace line interval for completing one whole picture frame.
  • the teletext data are transmitted during lines 13H, 15H, 16H and 21H in the vertical retrace line interval. Therefore, the transmission period may overlap with the switching time of the heads, which causes it likely to skip the teletext data at recording. Hence in the conventional systems, the teletext data and the video data can not be recorded on the same medium at the same time.
  • An object of the present invention is to provide a system for simultaneously recording the teletext data and video data on the same medium.
  • a system for recording teletext data included in a video signal on a tape by a recording device having a pair of heads which are switched at every field wherein the system comprises detector means for detecting teletext data, shifting means for shifting detected teletext data to a position in the video signal where the detected teletext data do not overlap with the switching time of the heads, and output means for outputting the video signal including the shifted teletext data to the recording device.
  • Fig. 1 shows an example of a teletext recording system according to an embodiment of the present invention wherein the teletext data and television data are recorded on a video tape.
  • the same numerals in Fig. 1 as in Fig. 3 indicate the same parts in Fig. 1.
  • the broadcast wave is tuned in by operating the tuner 1 and applied thereto through the antenna where the broadcast wave is converted into a television signal.
  • the television signal is fed to an A/D converter 18 through a switch SW1 and a buffer 9 so as to be converted into a digital signal.
  • the switch SW1 is also connected to a VCR so as to selectively connect the buffer 9 with the VCR when reproducing recorded data.
  • the digital television signal including the teletext data transmitted during lines 14H, 15H, 16H and 21H of the vertical retrace interval is fed to a field memory 15 wherein the teletext data are stored.
  • the field memory 15 is connected to a D/A converter 19 through an information adding circuit 17 and converted into an analog teletext signal.
  • the analog teletext signal is fed to a waveform shaping circuit 22, thereby restraining the influence of the carrier waves and a filter of the VCR. Only the teletext signal may be shaped at the shaping circuit 22 so that an optimum waveform is obtained without affecting the picture image created by the television signal.
  • the waveform shaping circuit 22 is selectively connected to a VCR and a television monitor through a switch SW2.
  • the television signal is further fed from the tuner 1 to a color burst signal extracting circuit 10 where a color burst signal is extracted from the television signal.
  • the color burst signal is applied to a PLL 11 to generate clock pulses based thereon. Namely, the color burst signal is phase-locked and converted into a clock signal having a frequency which is four times as high as the original subcarrier (burst) signal.
  • the clock pulses are fed from the PLL 11 to the A/D converter 18, field memory 15, information adding circuit 17, D/A converter 19, a sync separator 12, reset pulse generator 13, address controller 14, system controller 16, and an additional information determining circuit 20, respectively, thereby controlling the operational timing of the entire system.
  • the digital television signal from the A/D converter 18 is further fed to the additional information deciding circuit 20 and the sync separator 12.
  • a horizontal sync signal H and a vertical sync signal V are extracted from the television signal.
  • Horizontal driving pulses HD and vertical driving pulses VD are produced from the horizontal and vertical sync signals H and V, respectively.
  • the pulses are fed to a reset pulse generator 13 which accordingly generates reference control signals in the form of horizontal reset pulses HRP and vertical reset pulses VRP so as to control the addresses of the field memory 15.
  • the vertical reset pulse VRP resets both the addresses of the rows and column of the field memory 15 to zero, while the horizontal reset pulse HRP resets the column address and increases the row addresses one by one.
  • the column address is increased with every clock pulse fed from the PLL 11 one by one.
  • the address controller 14, in response to the reset pulses HRP and VRP, applies a signal to the field memory 15. Namely, when the row address of the field memory 15 reaches those corresponding to the lines 14H, 15H, 16H and 21H, data in the period are stored at the addresses corresponding to the lines 21H, 22H, 23H and 24H, respectively. When the row address reaches those of the lines 22H, 23H and 24H, data in the period are stored at the addresses corresponding to the lines 14H, 15H and 16H, respectively. Namely, teletext data are stored at the row addresses corresponding to 21H, 22H, 23H and 24H lines.
  • the address controller 14 is fed with standard signals such as read horizontal reset pulse and read vertical reset pulse from a signal generator 21 for reading out data from the field memory 15.
  • standard signals such as read horizontal reset pulse and read vertical reset pulse from a signal generator 21 for reading out data from the field memory 15.
  • the address of the read out data is reset, thereby controlling the reading of the field memory.
  • the address controller 14 further feeds a control signal to the system controller 16 which in response applies a signal to the information adding circuit 17.
  • the line information on 14H, 15H, 16H and 21H, that is, data on the original addresses of the teletext data are added to the data read out from the field memory 15.
  • the derived teletext data is converted into an analog signal at a D/A converter 19 and shaped at a waveform shaping circuit 22, and fed to the VCR to be recorded. Since, the teletext data is moved from the lines 14H, 15H, 16H and 21H shown in Fig. 2a to the lines 21H, 22H, 23H and 24H shown in Fig. 2b, the period of which does not overlap with the switching time of the heads, the data are not erased.
  • the connections of the switches SW1 and SW2 are changed to connect the input to the VCR and the output to the television monitor.
  • the television signal carrying the teletext data on the lines 21H, 22H, 23H and 24H is fed to the field monitor 15.
  • the addresses of the data are converted to the addresses of 14H, 15H, 16H and 21H at the field memory based on the data added at the information adding circuit 17. Therefore, the original signal which can be applied to the conventional decoder 2 shown in Fig. 3 is restored.
  • the teletext data is displayed on the television monitor.
  • the teletext data may be moved to other lines besides 21H, 22H, 23H and 24H.
  • the position in the television signal in the television signal is moved from an area at which the video heads are switched.
  • the teletext data are accurately recorded and reproduced together with the video signal.
  • the lines on which the teletext data are provided become closer to the effective area of picture, by decreasing the level of the teletext data, the effect on the picture is restrained.
  • the data on the original line positions of the teletext data are added at the information adding circuit 17, the lines may be freely moved to various positions without considering the model of the VCR equipment to be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Signal Processing For Recording (AREA)
  • Television Systems (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
EP19940110004 1993-06-28 1994-06-28 System zur Aufzeichnung von Teletextdaten Expired - Lifetime EP0631437B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP157466/93 1993-06-28
JP5157466A JPH0738841A (ja) 1993-06-28 1993-06-28 文字放送記録補助装置

Publications (3)

Publication Number Publication Date
EP0631437A2 true EP0631437A2 (de) 1994-12-28
EP0631437A3 EP0631437A3 (de) 1995-08-02
EP0631437B1 EP0631437B1 (de) 1998-09-02

Family

ID=15650291

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940110004 Expired - Lifetime EP0631437B1 (de) 1993-06-28 1994-06-28 System zur Aufzeichnung von Teletextdaten

Country Status (3)

Country Link
EP (1) EP0631437B1 (de)
JP (1) JPH0738841A (de)
DE (1) DE69412928T2 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9071872B2 (en) 2003-01-30 2015-06-30 Rovi Guides, Inc. Interactive television systems with digital video recording and adjustable reminders
US9100686B2 (en) 1998-09-17 2015-08-04 Rovi Guides, Inc. Electronic program guide with digital storage
US9294799B2 (en) 2000-10-11 2016-03-22 Rovi Guides, Inc. Systems and methods for providing storage of data on servers in an on-demand media delivery system
US10063934B2 (en) 2008-11-25 2018-08-28 Rovi Technologies Corporation Reducing unicast session duration with restart TV
US10075746B2 (en) 1998-07-14 2018-09-11 Rovi Guides, Inc. Client-server based interactive television guide with server recording

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11134345A (ja) * 1997-10-27 1999-05-21 Fuji Xerox Co Ltd 嗜好情報選択装置
US8805418B2 (en) 2011-12-23 2014-08-12 United Video Properties, Inc. Methods and systems for performing actions based on location-based rules

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0065378B1 (de) * 1981-05-07 1987-07-29 THORN EMI Ferguson Limited Videoaufzeichnungsanlage
KR920010811B1 (ko) * 1990-05-10 1992-12-17 주식회사 금성사 텔레비젼 수상기에서의 데이타 편집.기억 방법및 그 장치

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10075746B2 (en) 1998-07-14 2018-09-11 Rovi Guides, Inc. Client-server based interactive television guide with server recording
US9100686B2 (en) 1998-09-17 2015-08-04 Rovi Guides, Inc. Electronic program guide with digital storage
US9106947B2 (en) 1998-09-17 2015-08-11 Rovi Guides, Inc. Electronic program guide with digital storage
US9237371B2 (en) 1998-09-17 2016-01-12 Rovi Guides, Inc. Electronic program guide with digital storage
US9363553B2 (en) 1998-09-17 2016-06-07 Rovi Guides, Inc. Electronic program guide with digital storage
US9294799B2 (en) 2000-10-11 2016-03-22 Rovi Guides, Inc. Systems and methods for providing storage of data on servers in an on-demand media delivery system
US9071872B2 (en) 2003-01-30 2015-06-30 Rovi Guides, Inc. Interactive television systems with digital video recording and adjustable reminders
US9369741B2 (en) 2003-01-30 2016-06-14 Rovi Guides, Inc. Interactive television systems with digital video recording and adjustable reminders
US10063934B2 (en) 2008-11-25 2018-08-28 Rovi Technologies Corporation Reducing unicast session duration with restart TV
USRE50355E1 (en) 2008-11-25 2025-03-25 Adeia Technologies Inc. Reducing unicast session duration with restart TV

Also Published As

Publication number Publication date
DE69412928D1 (de) 1998-10-08
DE69412928T2 (de) 1999-04-15
EP0631437A3 (de) 1995-08-02
JPH0738841A (ja) 1995-02-07
EP0631437B1 (de) 1998-09-02

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